Creating Location Markers

Location Markers appear in the Locations Markers
ruler at the top of the timeline. The green
begin and
end markers, that define the length of the session, appear
automatically, but yellow custom markers can be created at any position in a
session.

There are multiple ways to create custom markers at the current playhead position:

using the keyboard shortcut (default is Num-↵, the Enter key on the numeric keypad)

using the Transport > Markers > Add
Mark from Playhead menu.

Adding a marker at an arbitrary location on the timeline (i.e. not at the playhead
position) can also be done either by:

right clicking in the Location Marker ruler, and
selecting New location marker